Well, consider this: most TV shows - particularly animated shows - are often mass-produced like sausage factory assembly line, they have to look where they can to cut corners to churn out what they can in a short amount of time, whereas I'm sure the original YouTube videos had the luxury of having as much time as they needed to make each video without having to meet deadlines and such. As I've said before, this is a concern I have about this supposed new Gorillaz TV show they're coming out with: the music videos have great production values with they way they mix media with 2D animation (not the character), CGI, and occasionally live action . . . I doubt very much a TV show will look that impressive, and I'm sure whatever animation style they go with, ithe characters will probably look considerably less detailed and well-designed as they do in their videos and other artwork.